Laser protection

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ednisley:

gels are completely transparent to infrared light &#; A CO&#; laser deposits enough concentrated energy to cut them just fine

If your co2 is ir, then how could it possibly cut them?..

They supposedly are made from polycarbonate, polyester plastics.

IR is a very wide range of frequencies&#; my ir fiber would probably go right through them.

Where did you get the photos? neat&#;

Lasers are not very useful without a lens. Once it passes through the lens there is a focal point, past the focal point the power drops off very quickly. Put something that reflects the beam and the power drops so much it&#;s pretty much useless. A couple inches away from the focal point on my 40W co2, I can&#;t mark a Kleenex tissue&#; virtually no power&#; wouldn&#;t stick my head in there and look at it either.

I&#;m sure all of us have used a magnifying glass to burn wood or other objects. This is how most lasers work&#; the beam is focused down to a small point where the power density is much higher&#; once it&#;s out of focus there is no power to do any real work.

The sun produces a very wide range of emf, including x-rays and gama rays from the suns corona. This damages the dna in your cells.

Burn is generating a broad spectrum of frequencies aside from the actual laser frequency&#; When the co2 burns it produces lots of these frequencies of light that can damage your eyes and your protective lenses allow through&#; using a co2, the IR is not visible to human eyes, but it&#;s a very bright burn when it operates.

If you don&#;t know the frequencies of the generated light (emf) how do you know if the safety glasses are really protecting you from other sources of laser generated emf that we know damages your eyes?

After one or two jobs, my brain told me to not look at the cut point, it&#;s too bright so there must be some type of damage occurring&#; the fiber is mesmerizing when it runs, so it&#;s hard not to look &#; but required now and then.

If you hunt around you can find experienced, highly technical people that have the equipment and knowledge to test these optics. I haven&#;t heard any of them say anything other than the $250 high end laser safety glasses are no better than the $20 Chinese safety glasses. Who are you going to believe, the salesman or the technical people?

I don&#;t value testing these glasses enough to figure out how to test them without deep pockets. I would think just diverting the beam and using one of the many optical sensors we have could allow at least a proportional value. It would be non destructive to the glasses and give you a good idea of their effectiveness at that particular frequency&#;

Sorry I was long winded, but I get tired of decisions generated out fear and not from facts.

All I&#;m saying is listen to everyone, we all have opinions, good or bad based on something. If the base of the opinion is from an Illumination Engineer, that might be more useful than the guy who&#;s doesn&#;t know what a laser is.

Use your knowledge along with your research and your common sense to guide you.

Understand how this stuff works is probably the most important lesson you can learn. Then you can separate the from Shinola. You will be safe, comfortable and happy with your decision&#; as it will be the best decision you could possibly make.

Then you can add your opinion here

Safety should be on every ones mind at all times when operating any tool/machine &#;

Good luck&#;

With the wide application of lasertechnology, such as industry laser, aesthetic medical laser, military laser,and other field, most lasers belong to the Class 3B or Class 4 laser system.According to ANSI Z136, one should wear protective goggles when the power reaches500mW, so as to avoid the hazards emitted by the high-power laser.

The laser safety glasses specific to Europeare the standard CE EN207 and CE EN208, and to the US the standard ANSI Z136.When determining the proper protective goggles, you should ask the provider fora certificate for basic protection.

The following questions are important whenselecting protective glasses.

1)      Why do we need to wearlaser safety glasses when working?

When working inthe laser industry, a single wavelength will be emitted, and sometimes severalwavelengths of radiation will radiate. Part of these wavelengths are visiblelight, but others are invisible (e.g., ultraviolet light, infrared light).Invisible light does not mean that our eyes will not hurt. Ultraviolet light(100-400nm) will damage the cornea, and laser light (400-nm) will penetrateour lens to damage the retina, causing irreversible ocular injury. Above mmis relatively safe, but when working in high-power laser environments, such aswith fiber lasers or CO2 lasers, our eyes will be damaged.

Due to thefocusing characteristics of the eye, it is 100,000 times more sensitive tolaser effects than the skin. Prolonged exposure to the laser radiation willhurt our eyes over time, even causing blindness. The laser filter plays a veryimportant role in protecting the eye from specific wavelengths, and maycompletely block or reduce the laser radiation to below the MPE (MaximumPossible Effect) level.

2)      What are the differenttypes of laser safety glasses?

There are twotypes of laser protection filter technology: reflection and absorption. Thereflective filter has a coated film, and absorption is divided into glass andpolycarbonate.

·        The reflection is a coat with athin film that allows specific wavelengths to bounce in different directionsand reflect through a broad scattering pattern. The price of these glasses isusually not expensive, and once the coating is detached or damaged, it willhurt our eyes immediately. This type of laser safety glasses is typically notrecommended.

·        The glass absorbing filter hasa highly visible light transmittance, which to a great extent is in its excellentoriginal color balance. At the same time, it can absorb higher heat density andbetter thermal stability, leading to a higher level of optical density. Increasingthe thickness can also enhance the protection level. Disadvantages are thatit&#;s very heavy and may not be comfortable to wear for a long period, and thecost is often steep.

·        The polycarbonate absorptionfilter is the most widely used and cost-effective. It is made with an absorbentlaser dye, is safe to wear for a long period without discomfort, and hassuperior shock resistance. With the improved technology of LaserPair, we offerthese laser safety glasses with a high protection level that guards againstvarious wavelengths all at once, lending themselves to superior visible lighttransmittance and excellent vision.

3)      How can I find the rightlaser safety glasses for me?

When choosingthe proper goggles for your specific application, it is also important toconsider the aspects of wavelength, power, beam diameter, beam delivery systemand operating environment. Please refer to the laser's parameters or usermanual, and a certified LSO (Laser Safety Officer) can advise as to which levelof laser safety glasses you should wear. If you need further help selecting theproper laser safety glasses, you are welcome to contact us, and our laserexperts will provide the best solution, according to your unique needs.

·        VLT (Visible Light Transmittance)

In visiblelight, the attenuation of light by a filter is defined as visible lighttransmittance. According to the American National Standards Organization (ANSI)Z136.7, the testing of VLT is determined by a standard light source. It isimportant to pay attention to the lighting conditions when using laser safetyglasses. If VLT is less than 20%, users should remain in a light area andensure their working environment has extra illumination. The higher thetransmittance, the better the visual view. NOTE:VLT is the average transmittance of visible light in the entire visiblespectrum.

·        Choose the relevant wavelength

ANSI Z136.1requires that the protection wavelength and optical density (OD) value are indicatedon the laser protection glasses. Generally, manufacturers will print the mostcommon range of wavelengths and OD (a small number of users are usingwavelengths not listed on the glasses). For further details, please consult withthe manufacturer for the most suitable glasses.

·        Choose a high OD protection level

OD laser filterswere designed to reduce specific wavelengths into the eyes while allowing somenormal light to pass through the eye. This absorption or filtering capabilityof the lens is expressed via OD, which is the attenuation of light through theoptical filter. The higher the value of OD, the higher the attenuation, witheach unit representing a 10 times greater improvement in protection.

Rating  

Transmittance

Light   transmittance reduction

OD 1

10-1

10x

OD 2

10-2

100x

OD 3

10-3

x

OD 4

10-4

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10,000x

OD 5

10-5

100,000x

OD 6

10-6

1,000,000x

OD 7

10-7

10,000,000x

OD 8

10-8

100,000,000x

·        Choose a comfortable frame

Selecting aframe in terms of its weight, shape and size to meet your individual needs isextremely important in the ultimate choice of laser safety glasses. Many of ourgoggles are designed to offer a universal fit and some models are geared towardprescription glasses. One size does not fit all, but adding a specific rope onthe backside or opting for an adjustable frame can fix this problem. Weconsider the user&#;s individual needs and provide comfortable eyewear with afashionable design that can be worn for a long stretch of time.

4)      How can I recognize theparameters of my laser safety glasses?

Here is a helpful example:

The right lens shows: 740-nm OD5+780-nm OD7+

American Standard: In the range of 740-nm, the light transmission from the lasersource is reduced by 100,000 times (spectral transmittance 10-5),while in the range of 780-nm, the light transmission from the laser sourceis reduced by 10,000,000 times (spectral transmittance 10-7).

The left lens shows: 740-nm DIR LB-nm IR LB7 LP S CE

740-nm: Protects wavelength

LP: manufacturer code; D: Continuous-wavelaser; I R Pulse laser

S: Mechanical resistance symbol

CE: Conformity to the directive

740-nm DIR LB5: EN 207 protection levelfor D (Continuous wave), I (Pulsed laser) and R (Q-switched pulsed laser) at740-nm

Europe Standard: The LB-Rating not only has an outer diameter, but also laserstability. LB1 to LB10 indicates that the lens can withstand a power density orenergy density of at least five (5) seconds or 50 pulses of laser radiation. Itmakes sense when the wavelength is combined with the laser mode (D, I, R or M).

Letter

Laser Type

Pulsed Length(s)

D

Continuous   wave laser

5s

I

Pulsed   laser

&#;10-6 to 0.25

R

Giant   pulsed laser

&#;10-9 to 10-6

M

Mode-locked   pulsed laser

&#;10-9

5)      Whatshould I be paying attention to after finding my suitable laser safetyglasses?  

Ø   The laser safety glasses cannot be used against other wavelengths oflasers other than those mentioned above.

Ø   Do not look directly into the laser beam.

Ø   Please clean and disinfect the glasses with soapy water or JohnsonGlass Cleaner, etc.

Ø   Do not place or store the glasses under sunlight or ahigh-temperature environment.

Ø   If these eye-protectors and filters against laser radiation are damaged,have scratched oculars or have undergone a color change, they can no longer beused.

Ø   Please note the risk of exposure to laser radiation due toreflection from reflective parts (including eye protectors), tilting ormisalignment of optical components.

Ø   In areas where there is a risk of exposure to laser radiation,appropriate eye protection should always be worn.

Ø   We recommend a lifetime of three (3) years when using the glasses regularly.This also depends on various factors such as use, cleaning storage andmaintenance. Frequent inspections and replacement are recommended if glassesare damaged.

Last but not least, when you spend a lot oftime selecting laser safety glasses, the cost is quite important, but alsoremember about the cost of your eyes. LaserPair commits to prioritizingprotective, cost-effective laser safety glasses that protect our eyes fromharmful reflections or scattering of high-power laser radiation, and providingcustomized services. If you need help in selecting laser protective goggles, pleasecontact us via , or call us directly.

Contact us to discuss your requirements of Laser Cutting Protection Film Supplier. Our experienced sales team can help you identify the options that best suit your needs.